import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class code1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int a=0,b=1,c=1;
        while(!(n>b&&n<c)) {
            a = b;
            b = c;
            c = a+b;
        }
        System.out.print(n==1?0:Math.min(n-b,c-n));
    }
}